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The Advantages of Dipping-molding Applied to Protective Caps for Connectors

Date: 2017-07-07
Views: 65

I. Introduction

From the latest global electronic components products structure, connector PCB electronic components has become one of the second pillar industries, and industries on the connector demand and technical requirements are constantly improve, so as to drive for the connector parts manufacturers in the development and production of more investment. These include protective caps, which act as components of the connector for insulation, shielding, dust control, oil proof and moisture proof. The liquid impregnation process (Dip Molding) is one of the protective cap mature technology, such as fast terminal insulation protection sleeve (the terminal sheath), RF coaxial connector protective helmet, protective cap and other high-speed connectors, as shown in figure 1.

 

The Advantages of Dipping-molding Applied to Protective Caps for Connectors  

Figure 1 fast connection terminal sheath (a), radio frequency coaxial connector protection cap (b) and high speed connector protection cap (c)

 

In the face of the diversified trend of connector structure and model, the advantages of the liquid impregnation process in the manufacture of connector protective caps are gradually reflected. This paper introduces the process and advantages and disadvantages of the liquid impregnation process.

 

Ⅱ.The introduction of liquid impregnation process
The liquid impregnated coating is thicker, soft, and can be removed from the mold independently as a protective product.

 

1. The role of liquid immersion plastic cap in connector field

The Advantages of Dipping-molding Applied to Protective Caps for Connectors

 

The main role of the plastic cap in the connector field is as follows:

(1) provide flexible protection during transportation, handling and storage so as not to scratch or deform.

(2) no protective cap oil, clean surface, with good antistatic effect (surface resistivity is less than 1011. Cm), and also a very good effect of dust, moisture barrier.

(3) high temperature, leaching with plastic protection products of raw materials are mostly PVC paste resin, there are silica gel materials, silica gel has better performance, can withstand high temperatures hit more than 150 DEG C, the low temperature performance of -60 C.

(4) no two pollution, environmental protection, protective cap is not in use process release of volatile substances, especially plastic impregnated silica gel products, is a tasteless, odorless, halogen-free and environmentally friendly materials, and can meet the requirements of military, aviation, etc. in the field of optical fiber connector.

(5) flame retardancy: the grade of hot wire (GWIT) of PVC dipped plastic products reaches 800 degrees /mm, while the grade of hot wire (GWIT) of silica gel dipped product reaches 900 /mm.

 

The Advantages of Dipping-molding Applied to Protective Caps for Connectors  

(impregnated silicone protective cap)

 

2 、 liquid impregnation process
The process of liquid impregnation mainly includes 5 steps: preheating, dipping, plasticizing, cooling and demoulding.
(1) preheating: heating the mold into the oven evenly;
(2) dip molding: immerse the heated mold into the sol, and control the mold lifting speed;
(3) plasticizing: heating the impregnated mold again to make the sol plasticized.
(4) cooling: after finishing, reduce the temperature to the normal temperature.
(5) release: the use of compressed air will be attached to the mold on the parting.
As shown:

 

The Advantages of Dipping-molding Applied to Protective Caps for Connectors

 

3, the development of liquid impregnation equipment
The liquid impregnation equipment mainly includes oven, dip tank, cooling device, demoulding device, electric control system, plastic mould and mould delivery system.

 

 

The Advantages of Dipping-molding Applied to Protective Caps for Connectors

 

Protective cap mold for radio frequency coaxial connector

Fang Pu's liquid dipping machine has been going from pure manual operation to fully automatic operation for about 15 years. At present, the automatic liquid impregnation equipment (see Figure 5) has realized the continuous process. Its advantages are:
1, the production efficiency is high, with terminal sheath as an example, daily output of up to 300 thousand / taiwan;
2, human cost is low, the original 1 people manage 1 machines, and now 1 people manage more than one machine;
3, also makes the quality of products have been well controlled.
In the future, liquid dipping equipment will develop in the direction of refinement and intelligence, and it is also the direction of the development of Pu Pu's future equipment.

The Advantages of Dipping-molding Applied to Protective Caps for Connectors

Figure 5 automatic liquid impregnation equipment

 

Ⅲ. the advantages and disadvantages of liquid impregnation process
Many connector caps can be made with liquid dip molding because of their own technological characteristics:
Advantage:
(1) rapid development of new products, generally from the mold to the sample out only 2-3 days, in line with the rapid development of connector trends;
(2) the mold cost is low, only the master, in the cost of several hundred to several thousand dollars, flexible structure design;
(3) batch efficiency is high and customer inventory cycle is reduced;
(4) the strength of the product is uniform, and there is no stress concentration point in the impregnated plastic products;
(5) energy consumption (water and electricity) is low.
Inferiority:
(1) the thickness uniformity is not easy to control, the process itself is limited, and the product thickness tolerance is slightly larger;
(2) only the master, not too complex structure processing products (such as buckle type jacket).

.

 

Ⅳ.Conclusion

The Advantages of Dipping-molding Applied to Protective Caps for Connectors

Fang Pu's liquid dipping machine has been going from pure manual operation to fully automatic operation for about 15 years. At present, the automatic liquid impregnation equipment (see Figure 5) has realized the continuous process. Its advantages are:
1, the production efficiency is high, with terminal sheath as an example, daily output of up to 300 thousand / taiwan;
2, human cost is low, the original 1 people manage 1 machines, and now 1 people manage more than one machine;
3, also makes the quality of products have been well controlled.
In the future, liquid dipping equipment will develop in the direction of refinement and intelligence, and it is also the direction of the development of Pu Pu's future equipment.

 

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